DJI FPV LCD Digital Countdown Alarm Timer Calculagraph for Phantom 1/ FC 40/ 2/ 2 Vision/ 2 Vision+ Quadcopter RC System Transmitter DT7 Remote Controller Fits DJI Phantom 1 / FC 40 / 2 / 2 Vision / 2 Vision+ original RC system DT7 remote controller Maximum countdown: 99 minute 59 seconds; Display: Digital; Diameter (cm): Approx 6.3; Colour: White; Powered by AG13 LR44 cell button battery (pre-installed) Press M button to set minutes (S button for seconds); Press M and S buttons together to reset; Press START / STOP button to start / stop countdown Clever design with loud 'beep' alarm lasting for about 30 seconds when timing out. When the time is out, alarm will be activated, press any button to stop it Package includes: Countdown Timer x 1 (DT7 remote controller is NOT included)